Engine Died While Driving HELP

Hello,

Son's car 2002 A6 Quatro 2.7T. Been Starting, idling fine and running fine. Just the other day about 40 miles into a drive, car died. He pulled over to side of the road and waited a few minutes, car started up and drove 5 more miles home. Have not driven since but starts right up. Codes turned up:

P0103

P0172

P0175

Approx 160,000 miles.

Anyone have suggestion on where to look or what section of this forum to search or ask?

Thanks,

Doug